Predator/Leg Grab
You jump forward and grab her legs as they kick through the water. The girl tries to yank them out of your grip, but you easily hold them tight and pull her in close. She opens her mouth to let out a scream, but you force your lips against hers and push your tongue into her mouth. She lets out a muffled moan and continues to struggle, but you pull her in tight and wrap one arm around her while the other hand slides up her wet one piece and gropes her young firm butt.
You break the kiss and stare deep into her eyes as she pants heavily, trying to catch her breath. You hook your groping hands down, sliding a finger between her legs and hooking her like a fish. Her whole body stiffens up and she produces a high pitched yelp.
She presses her arms against your chest, giving some frantic resistance, but then after a moment she stops and looks at you with sad eyes. "Wait, wait, just a moment, please."
Normally you'd just keep going, but there's something strange in her voice that makes you hesitate and pause your groping.
She breathes frantically for a moment, and without making eye contact says, "If—If this is going to happen fine, I know I can't stop you. But please, if you're going to do this, can you at least be gentle? Please? I'll let you do whatever you want and I won't struggle at all, just please don't hurt me."
You're eyes widen, your lips turn up in a smile. The girl is a lot smarter than most others in her position. You consider her request, or more accurately, gauge what kind of mood you're in.